Materials Literature
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ABSTRACT: With the use of Fourier Transform Infrared (FTIR) analysis applied to methylcellulose (MC) films, the hydrogen bonding formation between MC‐MC molecules and between MC and a series of different‐molecular‐weight PEGs was studied. The spectra of the films were interpreted in terms of the symmetry distortion of…
The major linear and nonlinear electric properties of urea and thiourea have been calculated at different levels of approximation with respect to the treatment of the electron correlation contribution. The basis set saturation effects were studied by comparing the results computed in three different basis sets of incr…
The phosphors of high luminous efficiency for plasma display panel (PDP) applications must have high purity, single phase, uniform particle size, and clean surfaces. Photoluminescence characteristics of europium-doped yttrium oxide phosphors of spherical shape as well as optimum synthetic conditions for maximal lumine…
The time evolution of the free surface of asymmetric diblock copolymers of polystyrene and poly(methyl methacrylate) on a strongly interacting surface was studied with atomic force microscopy. The surface morphology underwent morphological transitions to satisfy commensurability conditions. These transformations were…
Nickel sorption in illite suspensions was studied as a function of pH (4.5–8.0), reaction time (3 h, 24 h, and 1 wk) and ionic strength ( and 0.003 M ) using x‐ray absorption spectroscopy (XAS) to characterize the Ni sorption complexes formed. The formation of Ni‐Al layered double hydroxide (LDH) phases was observed a…
Based on symmetry breaking steps under one-pot conditions, simple molybdenum oxide-based building blocks initially assemble to 'giant molecular wheels' in a fast process followed by further slower assembly processes leading stepwise to more complex mesoscopic architectures including spherical ones and finally to those…
Nanocomposites of polyaniline (PANI) and the semiconducting metal sulfides CdS and Cu2S were prepared from the respective metal trifluoromethanesulfonates co-dissolved in N-methylpyrrolidone. Metal sulfide particles with typical diameters of 1–2 nm formed in situ upon addition of Li2S; the nanocomposites were subseque…
Computer modelling techniques are used to investigate the surface properties and defect chemistry of the La2NiO4 material. Relaxed surface structures and energies are calculated for the low index planes which are used to predict the equilibrium crystal morphology. The {111} surface is calculated to dominate in the abs…
Dielectric spectroscopy is one of the most commonly used techniques for the investigation of the dynamic response of glass-forming materials. The tremendous slow-down of the particle motions when approaching the glass transition and especially the fast processes in glass-forming materials, which have come into the foc…
SUMMARIES Two samples of pure cellulose of different degree of polymerisation values were submitted to oxidation degradation by a specific agent (sodium metaperiodate) and by a non-specific agent (sodium hypochlorite). The degradation process was monitored by viscosity measurements in order to check the degree of poly…
The formation and growth of gas-made silica particles by co-agulation and sintering is investigated theoretically. A model for the characteristic time for silica sintering is proposed defining a minimum primary particle diameter above which macroscopic expressions are applied. The value of the minimum primary particle…
Abstract Scratch behavior in neat and talc‐filled high crystallinity polypropylene (PP) copolymers containing various additives is investigated using a cosntant load scratch test and two types of indentation tests (Rockwell and Shore D). The talcfilled PP copolymer exhibits high scratch visibilityand scratch depth. Th…
Abstract Simulated annealing approach was successfully applied to solve three unknown molecular structures from X-ray laboratory powder data using a priory known structural fragments. Some possible developments of the method are discussed.
Aluminum capacitor foil with a tunnel etch structure was reacted with boiling water to deposit a layer of psuedoboehmite and was then anodized to voltages between 55 and 540 V in a neutral hot borate solution. The resulting composite oxide film consists of two layers of crystalline barrier γ′-oxide containing a high d…
Because of recent discovery that the effect of onium cation symmetricity on its properties could be manipulated to benefit the application of an electrochemical double-layer capacitor, a series of new unsymmetrical onium salts was synthesized and evaluated as electrolyte solutes in nonaqueous solvents. A relationship…
The formation of two unique μ-phenoxo-bridged nickel(II) complexes with l,5-diazacyclooctane (DACO) ligands functionalized by additional phenol donor pendants has been achieved and the complexes have been characterized by IR, elemental analyses, conductivity, thermal analysis, and UV-Vis techniques. Single-crystal X-r…
The wetting and wicking behavior of linen treated with low-temperature oxygen and argon plasma is presented. Wetting and wicking abilities of plasma treated linen are investigated using contact angles and upward and downward water wicking methods. The downward wicking method is more suitable for distinguishing the eff…
Binary phase diagrams of small particle systems, which consist of a liquid phase with pure solid phases, have been evaluated from the information on the Gibbs energy in the bulk and the surface tension of the liquid phase. As the size of the particle decreases, the melting point of the pure component decreases and the…
The pore size distributions of six mesoporous silica materials were determined by measuring the 1H NMR signal from the non-frozen fraction of confined acetonitrile as a function of temperature. The average pore size distributions determined by NMR agree fairly well with those obtained by N2 sorption measurements. Howe…
In order to obtain more information on the precipitation of nitrides, especially cubic type nitride CrN in weld heat affected zones of duplex stainless steels, the microstructures of thermally simulated weld heat affected zones (HAZs) of a commercial duplex stainless steel were characterized. The precipitates in the s…